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(No Model.) 0 M ALD ANER 2 Sheets-Sheet 1. FEEDING- MECHANISM FOR SEWING MACHINES. N0. 496,660.

Patented May 2, 1893.

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(No Model.) 2 Sheets-Sheet 2.

club-AM FEEDING MECHANISM FOR SEWING-MAGHINES.- No. 496,660. Patented MayZ, 1-893.

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UNITED STATES PATENT OFFICE.

CHARLES MALDANER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE DIAMOND SEWING MACHINE COMPANY, OF SAME PLACE.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 496,660, dated May 2, 1893.

Application filed December 13, 1892. Serial No. 455,049- (No model.)

To all whom it may concern.-

Be it known that I, CHARLES MALDANER, of Chicago, Illinois, have invented certain new and useful Improvements in Sewing- Maghines, of which the following'is a specifica- This invention relates to a feed mechanism for sewing machines, and the said mechanism is of that class which is denominated four motion feeds.

The object of the invention is 'to provide a simple and eflicient means whereby the up,

forward, and back strokes of the feed bar are made positive, and to combine with said means devices for adjusting the feed so as to vary the length of the stitch.

In the accompanying drawings, Figure 1 is a perspective view of a sewing machine head and showing the feed and adjusting mechanisms. Figs. 2, 3 and 4 are sectional elevations of the bed showing the feed bar and feed dog in side elevation and in different positions; and Fig. 5 is a broken sectional view of the adjusting mechanism for the feed shaft. Fig;

5 shows a modification of the driving shaft 7 eccentric.

In the drawings, 6 represents the base or bed of the machine.

7 represents a feed bar driving shaft which has one of its ends loosely mounted, and preferably in a ball bearing, in the stud 8. Said shaft is free to rock axially and also to move back and forth or vibrate in a horizontal plane in the straight slot 9 of a lug 10 depending from the base of the machine. Toward its forward end said rod is bent to provide a cranked journal 11 which works loosely in the lower end of the pitman 12 which is of usual construction. To reduce friction I prefer to employ a ball bearing for the cranked journal 11 in the pitman 12. This pitman is so driven as to move up and down and forward and back in a manner which is well un- The result of the forback and forth, said movement being in a horizontal plane owing to the fact that the slot 9 in lug 10 is of such transverse diameter as to prevent vertical movement of the shaft while permitting the horizontal movement and without undue friction. Owing to the vertical movement of the pitman and to the cocentric connection thereof with the shaft 7, the latter is also caused,attwo points in its work- 5 5 ing cycle, to rock or oscillatein its bearings. To permit this rocking or oscillating movement the rear end of said rod must be confined within the stud by aball or other equivalent bearing. The feed shaft 7 is constructed 6o at its rear end, just forward of its connection with the stud8, to impart alifting movement to the feed bar 13. Said bar is fitted to slide in grooves or ways in the base of the machine, as is usual, and carries the feed dog 14 and has the wearing shoe 15 at the point where it is engaged by the feed shaft.

The particular means which I have shown for imparting the lifting movement to the feed bar consists in providing the shaft 7 with a cam surface which may be readily done by flattening the top of said shaft at the point where it contacts with the shoe, as seen at 7 in Figs. 2, 3 and 4. The same resultmaybe accomplished by the employment of a separate cam or eccentric collar 7, as shown in Fig. 5 The feed bar is connected by thespiral spring 16 with the shaft 7, the latter having a pin 7 to engage the spring and the feed bar is lowered by the pull of the spring under the tension imparted by the shaft. The forward and backward movements of the feed bar are accomplished by means of the back and forth movement of the shaft 7 operating in conjunction with the adjusting bar 17. Said bar is constructed in two sections having telescopic connection with each other, as clearly shown in Fig. 5, and the forward end of said bar is provided with a binding screw 18 which is clamped in any desired position in the slot o 19 in the base of the machine. The sleeve member of this adjusting bar has an arm 20 formed integrally therewith and said arm 20 has a ball bearing 21 for the feed bar driving shaft 7. This bearing permits both the lateral and rocking movement of the shaft and also permits the sleeve member to be adjusted lengthwise of the shaft.

To vary the length of stroke of the feed bar,

and consequently the length of the stitch, the telescopic member of the adjusting bar 17 is moved on its fellow, the arm sliding on the shaft 7 and in consequence thereof shortening or lengthening the stroke. The sleeve member is of such length that the arm 20 may be moved close to the outer end of the feed bar driving shaft and the length of the stitch may be thus varied from practically nothing to six to the inch or even more.

It will be observed that the adjusting bar does not slide through the feed bar as in previous constructions, but its outer end is fastened to the bar, preferably by means of the screw l7 shown in Fig. 5, and the making of the ad usting bar in sections which have telescopic connection with each other is a declded improvement in the construction of the device.

The operation will be understood by reference to Fig. 1 of the drawings and by observing the several positions of the feed bar, which are indicated, respectively,in Figs. 2, 3 and 4.

The feed bar is shown in Fig. 2 about midway of its up stroke and the shaft 7 is rocking in a direction to bring its corner in contact with the shoe.

In Fig. 3 the feed dog is shown raised to the position to engage the cloth and is starting on the forward or feed stroke.

In Fig. 4 the feed bar is shown at its lower limit of travel and at the inception of its backward movement. The shaft 7 presents its flat side to the shoe and in rocking to this position it has drawn the feed bar with it through the intervention of the spring.

I am enabled by the means above described to impart to the feed bar the forward, backward and upward movements, each of said movements being positive. For the down movement I prefer to employ the spring 16, as the rocking of the arm serves to tension the spring and draw the bar down so that this movement may also be said to be positive, and this construction is therefore preferable to one wherein the spring is mounted on the bed as shown at 22 in Fig. 1,although a spring of this latter character may be employed. Other means for preventing vertical movement of the feed bar driving shaft may be substituted for the slotted lug or guide.

I claim- 1. A feed mechanism for sewing machines, comprising in combination with the feed bar, an oscillating and vibratory driving shaft connected therewith, and means for imparting the described movements to said driving shaft, said shaft having an eccentric bearing on the feed bar whereby the oscillation of said shaft is caused to lift said bar and the vibrations of said shaft are caused to reciprocate said bar, substantially as described.

comprising in com ination a reciprocating and vertically mova le feed bar, an oscillating and vibratory shaft connected therewith, said shaft having an eccentric bearing on the feed bar and a pitman having a vertical and back and forth movement and having a crank connection with said driving shaft, substantially as described.

3. A feed mechanism for sewing machines, comprising in combination with a reciprocating and vertically movable feed bar, an oscillating and vibratory driving shaft adjustably connected therewith, means for imparting the described movements to said driving shaft, and said shaft having an eccentric bearing upon the feed bar whereby the oscillation of saidshaft is caused to lift said feed bar and the vibrations thereof are caused to reciprocate it, substantially as described.

4. A feed mechanism for sewing machines, comprising in combination with the feed bar, an oscillating and vibratory driving shaft, means for imparting the described movements to said driving shaft and the latter having an eccentric bearing on the feed bar and an adjusting bar constructed in two sections slidably connected together and one of which sections is secured to the feed bar and the other of which is adjustably secured to the driving shaft, substantially as described.

5. A feed mechanism for sewing machines, comprising in combination with the feed-bar, an oscillating and vibratory driving shaft, means for imparting the described movements to said driving shaft and the latter having an eccentric bearing on the feed-bar, an adjusting bar constructed in two sections having a sliding connection with each other, one of said sections being secured to the feed bar and the other having an arm formed integrally therewith, and said arm having a ball bearing upon the driving shaft, substantially as described.

6. A feed mechanism for sewing machines, comprising in combination a bed or frame, an operating pitman a reciprocating and ver tically movable feed bar, an oscillating and vibratory driving shaft connected therewith, said shaft having a ball hearing at its outer end upon the bed or frame, a crank on its forward end and a ball bearing connecting said crank with the operating pitman, substantially as described.

7. A feed mechanism for sewing machines comprising in combination with a reciprocating and vertically movable feed bar, an oscillating and vibratory driving shaft connected therewith, means for imparting the described movements to said driving shaft, said shaft having an eccentric bearing upon the feed bar and a spring connection between the feed bar and driving shaft, substantially as described.

8. A feed mechanism for sewing machines,

2. A feed mechantsm for sewing machines,

eeaeeo I 3 comprising in combination with the feed bar ment, and said shaft having an eccentric a bed or frame, an operatingpitman, a driv- V bearing on the feed bar, substantially as deing shaft connected therewith and having a scribed.

crank connection with the operating pitman OHARLES-MALDANER. 5 and a pivotal connection with the frame at Witnesses:

its end opposite the crank, a slotted guide O. O. LINTHIOUM,

for confining said shaft against vertical move- N. M. BOND; 

